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| <div class="sub-title"><span class="module-label-in-type">Module</span> <a href="../../../../module-summary.html">openj9.sharedclasses</a></div> |
| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">com.ibm.oti.shared</a></div> |
| <h1 title="Interface SharedClassURLHelper" class="title">Interface SharedClassURLHelper</h1> |
| </div> |
| <section class="description"> |
| <dl class="notes"> |
| <dt>All Superinterfaces:</dt> |
| <dd><code><a href="SharedClassHelper.html" title="interface in com.ibm.oti.shared">SharedClassHelper</a></code>, <code><a href="SharedHelper.html" title="interface in com.ibm.oti.shared">SharedHelper</a></code></dd> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">SharedClassURLHelper</span><span class="extends-implements"> |
| extends <a href="SharedClassHelper.html" title="interface in com.ibm.oti.shared">SharedClassHelper</a></span></div> |
| <div class="block"><p>SharedClassHelper API that stores and finds classes by using URL paths.</p> |
| <h2>Description</h2> |
| <p>A SharedClassURLHelper is obtained by calling getURLHelper(ClassLoader) on a SharedClassHelperFactory.</p> |
| <p>The SharedClassURLHelper is designed for ClassLoaders that load classes from many different locations, without the concept of a classpath. |
| A ClassLoader may find and store classes in the cache using any URL.</p> |
| <h2>Usage</h2> |
| <p>The ClassLoader should call findSharedClass after looking in its local cache and asking its parent (if one exists). |
| If findSharedClass does not return null, the ClassLoader calls defineClass on the byte[] that is returned.</p> |
| <p>The ClassLoader calls storeSharedClass immediately after a class is defined, unless the class that is being defined was loaded from the shared cache.</p> |
| <p>If partitions are required, the ClassLoader is responsible for coordinating the creation and use of partition Strings.</p> |
| <p>Classes can be stored only by using URLs that have file or jar protocols, and that refer to existing resources. |
| The presence of any other protocol in a URL prevents SharedClassURLHelper from locating and storing classes in the shared cache.</p> |
| <h2>Dynamic Cache Updates</h2> |
| <p>Because the shared cache persists beyond the lifetime of a JVM, classes in the shared cache can become out of date (stale).</p> |
| Classes in the cache are automatically kept up to date by default:<br> |
| <p>If findSharedClass is called for a class that exists in the cache but which has been updated on the filesystem since it was stored, |
| then the old version in the cache is automatically marked stale and findSharedClass returns null. |
| The ClassLoader should then store the updated version of the class.</p> |
| <p>Note that jar/zip updates will cause all cache entries that are loaded from that jar/zip to be marked stale.</p> |
| <p>(This behaviour can be disabled by using the correct command-line option. See -Xshareclasses:help)</p> |
| <p>It is also assumed that the ClassLoader maintains a read lock on jar/zip files opened during its lifetime, preventing their modification. |
| This prevents the cache from having to constantly check for updates.</p> |
| <h2>Partitions</h2> |
| <p>A partition can be used when finding or storing a class, which allows modified versions of the same class |
| to be stored in the cache, effectively creating <q>partitions</q> in the cache.</p> |
| <p>Partitions are designed for bytecode modification such as the use of Aspects. It is the responsibility of the ClassLoader |
| to create partitions that describe the type of modification performed on the class bytes.</p> |
| <p>If a class is updated on the filesystem and automatic dynamic updates are enabled, then all versions of the class across |
| all partitions will be marked stale.</p> |
| <h2>Class metadata</h2> |
| <p>A ClassLoader might create metadata when loading and defining classes, such as a jar manifest or security data. |
| None of this metadata can be stored in the cache, so if a ClassLoader is finding classes in the shared cache, it must load |
| any metadata that it needs from disk before defining the classes.</p> |
| <h2>Security</h2> |
| <p>A SharedClassHelper will only allow classes that were defined by the ClassLoader that owns the SharedClassHelper to be stored in the cache.</p> |
| <p>If a SecurityManager is installed, SharedClassPermissions must be used to permit read/write access to the shared class cache. |
| Permissions are granted by ClassLoader classname in the java.policy file and are fixed when the SharedClassHelper is created.</p> |
| <p>Note also that if the createClassLoader RuntimePermission is not granted, ClassLoaders cannot be created, |
| which in turn means that SharedClassHelpers cannot be created.</p> |
| <h2>Compatibility with other SharedClassHelpers</h2> |
| <p>Classes stored by using the SharedClassURLHelper can be retrieved by using the SharedClassURLClasspathHelper and vice versa. |
| This is also true for partitions that can be used across these two helpers.</p></div> |
| <dl class="notes"> |
| <dt>See Also:</dt> |
| <dd><a href="SharedClassURLHelper.html" title="interface in com.ibm.oti.shared"><code>SharedClassURLHelper</code></a>, |
| <a href="SharedClassHelperFactory.html" title="interface in com.ibm.oti.shared"><code>SharedClassHelperFactory</code></a>, |
| <a href="SharedClassPermission.html" title="class in com.ibm.oti.shared"><code>SharedClassPermission</code></a></dd> |
| </dl> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method.summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab3" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab3', 3)" class="table-tab">Abstract Methods</button></div> |
| <div id="method-summary-table.tabpanel" role="tabpanel"> |
| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"><code>byte[]</code></div> |
| <div class="col-second even-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"><code><span class="member-name-link"><a href="#findSharedClass(java.lang.String,java.net.URL,java.lang.String)">findSharedClass</a></span>​(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link" target="_blank">String</a> partition, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" class="external-link" target="_blank">URL</a> path, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link" target="_blank">String</a> className)</code></div> |
| <div class="col-last even-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"> |
| <div class="block">Finds a class in the shared cache by using a specific URL, class name, and user-defined partition (see <q>Partitions</q>).</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"><code>byte[]</code></div> |
| <div class="col-second odd-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"><code><span class="member-name-link"><a href="#findSharedClass(java.net.URL,java.lang.String)">findSharedClass</a></span>​(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" class="external-link" target="_blank">URL</a> path, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link" target="_blank">String</a> className)</code></div> |
| <div class="col-last odd-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"> |
| <div class="block">Finds a class in the shared cache by using a specific URL and class name.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"><code>boolean</code></div> |
| <div class="col-second even-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"><code><span class="member-name-link"><a href="#setMinimizeUpdateChecks()">setMinimizeUpdateChecks</a></span>()</code></div> |
| <div class="col-last even-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"> |
| <div class="block">Minimizes update checking on jar files for optimal performance.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"><code>boolean</code></div> |
| <div class="col-second odd-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"><code><span class="member-name-link"><a href="#storeSharedClass(java.lang.String,java.net.URL,java.lang.Class)">storeSharedClass</a></span>​(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link" target="_blank">String</a> partition, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" class="external-link" target="_blank">URL</a> path, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link" target="_blank">Class</a><?> clazz)</code></div> |
| <div class="col-last odd-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"> |
| <div class="block">Stores a class in the shared cache by using the URL location it was loaded from and a user-defined partition (see <q>Partitions</q>).</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"><code>boolean</code></div> |
| <div class="col-second even-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"><code><span class="member-name-link"><a href="#storeSharedClass(java.net.URL,java.lang.Class)">storeSharedClass</a></span>​(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" class="external-link" target="_blank">URL</a> path, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link" target="_blank">Class</a><?> clazz)</code></div> |
| <div class="col-last even-row-color method-summary-table-tab2 method-summary-table method-summary-table-tab3"> |
| <div class="block">Stores a class in the shared cache by using the URL location it was loaded from.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods.inherited.from.class.com.ibm.oti.shared.SharedClassHelper">Methods declared in interface com.ibm.oti.shared.<a href="SharedClassHelper.html" title="interface in com.ibm.oti.shared">SharedClassHelper</a></h3> |
| <code><a href="SharedClassHelper.html#getSharingFilter()">getSharingFilter</a>, <a href="SharedClassHelper.html#setSharingFilter(com.ibm.oti.shared.SharedClassFilter)">setSharingFilter</a></code></div> |
| <div class="inherited-list"> |
| <h3 id="methods.inherited.from.class.com.ibm.oti.shared.SharedHelper">Methods declared in interface com.ibm.oti.shared.<a href="SharedHelper.html" title="interface in com.ibm.oti.shared">SharedHelper</a></h3> |
| <code><a href="SharedHelper.html#getClassLoader()">getClassLoader</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method.detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="findSharedClass(java.net.URL,java.lang.String)"> |
| <h3>findSharedClass</h3> |
| <div class="member-signature"><span class="return-type">byte[]</span> <span class="element-name">findSharedClass</span>​<span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" class="external-link" target="_blank">URL</a> path, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link" target="_blank">String</a> className)</span></div> |
| <div class="block"><p>Finds a class in the shared cache by using a specific URL and class name. |
| A class will be returned if it was stored against the same URL.</p> |
| <p>Null is returned if the class cannot be found or if it is stale (see <q>Dynamic cache updates</q>).</p> |
| <p>To obtain an instance of the class, the byte[] returned must be passed to defineClass by the caller ClassLoader.</p> |
| <p>Also returns false if the URL at foundAtIndex is not a file URL or if the resource it refers to does not exist. </p></div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>path</code> - URL. |
| A URL path. Cannot be null.</dd> |
| <dd><code>className</code> - String. |
| The name of the class to be found</dd> |
| <dt>Returns:</dt> |
| <dd>byte[]. |
| A byte array describing the class found, or null.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="findSharedClass(java.lang.String,java.net.URL,java.lang.String)"> |
| <h3>findSharedClass</h3> |
| <div class="member-signature"><span class="return-type">byte[]</span> <span class="element-name">findSharedClass</span>​<span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link" target="_blank">String</a> partition, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" class="external-link" target="_blank">URL</a> path, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link" target="_blank">String</a> className)</span></div> |
| <div class="block"><p>Finds a class in the shared cache by using a specific URL, class name, and user-defined partition (see <q>Partitions</q>).</p> |
| <p>A class returned only if it was stored against the same URL, and was using the same partition. |
| Null is returned if the class cannot be found or if it is stale (see <q>Dynamic cache updates</q>).</p> |
| <p>To obtain an instance of the class, the byte[] returned must be passed to defineClass by the caller ClassLoader.</p> |
| <p>Also returns false if the URL at foundAtIndex is not a file URL or if the resource it refers to does not exist. </p></div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>partition</code> - String. |
| User-defined partition if finding modified bytecode (see <q>Partitions</q>). |
| Passing null is equivalent of calling non-partition findSharedClass call.</dd> |
| <dd><code>path</code> - URL. |
| A URL path. Cannot be null.</dd> |
| <dd><code>className</code> - String. |
| The name of the class to be found</dd> |
| <dt>Returns:</dt> |
| <dd>byte[]. |
| A byte array describing the found class, or null.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="storeSharedClass(java.net.URL,java.lang.Class)"> |
| <h3>storeSharedClass</h3> |
| <div class="member-signature"><span class="return-type">boolean</span> <span class="element-name">storeSharedClass</span>​<span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" class="external-link" target="_blank">URL</a> path, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link" target="_blank">Class</a><?> clazz)</span></div> |
| <div class="block"><p>Stores a class in the shared cache by using the URL location it was loaded from. |
| The class that is being stored must have been defined by the caller ClassLoader and must exist in the URL location specified. |
| Returns <code>true</code> if the class is stored successfully or <code>false</code> otherwise.</p> |
| <p>Will return <code>false</code> if the class that is being stored was not defined by the caller ClassLoader.</p> |
| <p>Also returns <code>false</code> if the URL at foundAtIndex is not a file URL or if the resource it refers to does not exist.</p></div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>path</code> - URL. |
| The URL path that the class was loaded from. Cannot be null.</dd> |
| <dd><code>clazz</code> - Class. |
| The class to store in the shared cache</dd> |
| <dt>Returns:</dt> |
| <dd>boolean. |
| True if the class was stored successfully, false otherwise.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="storeSharedClass(java.lang.String,java.net.URL,java.lang.Class)"> |
| <h3>storeSharedClass</h3> |
| <div class="member-signature"><span class="return-type">boolean</span> <span class="element-name">storeSharedClass</span>​<span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link" target="_blank">String</a> partition, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" class="external-link" target="_blank">URL</a> path, |
| <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link" target="_blank">Class</a><?> clazz)</span></div> |
| <div class="block"><p>Stores a class in the shared cache by using the URL location it was loaded from and a user-defined partition (see <q>Partitions</q>).</p> |
| <p>The class being stored must have been defined by the caller ClassLoader and must exist in the URL location specified. |
| Returns <code>true</code> if the class is stored successfully or <code>false</code> otherwise.</p> |
| <p>Will return <code>false</code> if the class being stored was not defined by the caller ClassLoader.</p> |
| <p>Also returns <code>false</code> if the URL at foundAtIndex is not a file URL or if the resource it refers to does not exist.</p></div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>partition</code> - String. |
| User-defined partition if storing modified bytecode (see <q>Partitions</q>). |
| Passing null is equivalent of calling non-partition storeSharedClass call.</dd> |
| <dd><code>path</code> - URL. |
| The URL path that the class was loaded from. Cannot be null.</dd> |
| <dd><code>clazz</code> - Class. |
| The class to store in the shared cache</dd> |
| <dt>Returns:</dt> |
| <dd>boolean. |
| True if the class was stored successfully, false otherwise.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="setMinimizeUpdateChecks()"> |
| <h3>setMinimizeUpdateChecks</h3> |
| <div class="member-signature"><span class="return-type">boolean</span> <span class="element-name">setMinimizeUpdateChecks</span>()</div> |
| <div class="block"><p>Minimizes update checking on jar files for optimal performance.</p> |
| <p>By default, when a class is loaded from the shared class cache, the timestamp of the container it was originally loaded from is |
| compared with the timestamp of the actual container on the filesystem. If the two do not match, the original class is marked stale |
| and is not returned by findSharedClass(). These checks are not performed if the container is held open by the ClassLoader.</p> |
| <p>If the ClassLoader does not want to open the container, but doesn't want the timestamp to be constantly checked when |
| classes are loaded, it should call this function immediately after the SharedClassURLHelper object has been created. |
| After this function has been called, each container timestamp is checked once and then is only checked again if the |
| container jar file is opened.<br> |
| <p>This feature cannot be unset.</p></div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>boolean. |
| True if the feature has been successfully set, false otherwise.</dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <!-- ========= END OF CLASS DATA ========= --> |
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